WebTransportDatagramDuplexStream: outgoingMaxAge property

Baseline 2026

Newly available

Since March 2026, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The outgoingMaxAge property of the WebTransportDatagramDuplexStream interface gets or sets the maximum age for outgoing datagrams, in milliseconds.

Value

A number, or null if no maximum age has been set.

Examples

const url = "https://example.com:4999/wt";

async function initTransport(url) {
  // Initialize transport connection
  const transport = new WebTransport(url);

  // The connection can be used once ready fulfills
  await transport.ready;

  const datagrams = transport.datagrams;

  // set outgoingMaxAge
  datagrams.outgoingMaxAge = 2000;

  // get outgoingMaxAge
  console.log(datagrams.outgoingMaxAge);
}